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Thread: Setting up/testing a mail server

  1. #1
    Join Date
    Feb 2007
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    Setting up/testing a mail server

    Hi, I just tested my mail server for security. I got only this warning saying: Reverse DNS does not match SMTP Banner.

    what does this mean? I have my own server and notice my host name I use my domain name but at the end before the .com I see my ISP'S name.

    For example instead of having a hostname like domain.com.

    I have something like this: domain.ISP.com

    How do I change this? I manually deleted the .ISP part but still my ISP name automatically gets attached.

    Also is there any good tutorial on teaching how to setup postfix with mysql?

  2. #2
    Join Date
    Dec 2006
    Location
    Chicago
    Beans
    3,839

    Re: Setting up/testing a mail server

    You can view your SMTP banner with this command:
    Code:
    echo QUIT|nc 127.0.0.1 25
    To change the hostname for postix:
    Code:
    sudo postconf -e myhostname=mydomain.com
    sudo /etc/init.d/postfix restart
    Last edited by cdenley; April 1st, 2010 at 07:45 PM.

  3. #3
    Join Date
    Mar 2010
    Location
    Los Angeles, CA
    Beans
    231
    Distro
    Ubuntu 10.04 Lucid Lynx

    Re: Setting up/testing a mail server

    You also want to make sure that your rDNS matches your A records. If you lack forward confirming reverse DNS, you're likely to get spam-binned most places.
    Postfix problems? Come find me in #postfix on the freenode IRC network.

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